Amsterdam UMC, University of Amsterdam, Emma Children's Hospital, Pediatric Hematology, Amsterdam, the Netherlands; Sanquin Research and Landsteiner Laboratory, Immunopathology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands. Electronic address: j.j.gerritsma@amsterdamumc.nl. Amsterdam UMC, University of Amsterdam, Emma Children's Hospital, Pediatric Hematology, Amsterdam, the Netherlands. Electronic address: i.oomen@amsterdamumc.nl. Sanquin Research and Landsteiner Laboratory, Blood Cell Research, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands. Sanquin Research and Landsteiner Laboratory, Experimental Immunohematology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands. Electronic address: e.vanderschoot@sanquin.nl. Amsterdam UMC, University of Amsterdam, Department of Hematology, Amsterdam, the Netherlands. Electronic address: b.j.biemond@amsterdamumc.nl. Sanquin/LUMC, Center for Clinical Transfusion Research, Leiden, the Netherlands. Electronic address: j.g.vanderbom@lumc.nl. Amsterdam UMC, University of Amsterdam, Emma Children's Hospital, Pediatric Hematology, Amsterdam, the Netherlands; Leiden University Medical Center, Department of Clinical Epidemiology, Leiden, the Netherlands. Electronic address: c.j.fijnvandraat@amsterdamumc.nl.